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Finding the Fourth Proportional to 675.25, 1,012.88 and 219.25

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Solution

The fourth proportional to 675.25, 1,012.88 and 219.25 is: 328.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.25 : 1,012.88 = 219.25 : x
  2. Step 2: Convert to fraction form
    675.25/1,012.88 = 219.25/x
  3. Step 3: Cross multiply
    675.25x = 1,012.88 × 219.25
  4. Step 4: Simplify right side
    675.25x = 222,073.94
  5. Step 5: Solve for x
    x = 222,073.94/675.25
  6. Step 6: Final answer
    x = 328.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.